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Communication dans un congrès

Unsupervised representation learning by predicting image rotations

Abstract : Over the last years, deep convolutional neural networks (ConvNets) have transformed the field of computer vision thanks to their unparalleled capacity to learn high level semantic image features. However, in order to successfully learn those features, they usually require massive amounts of manually labeled data, which is both expensive and impractical to scale. Therefore, unsupervised semantic feature learning, i.e., learning without requiring manual annotation effort, is of crucial importance in order to successfully harvest the vast amount of visual data that are available today. In our work we propose to learn image features by training ConvNets to recognize the 2d rotation that is applied to the image that it gets as input. We demonstrate both qualitatively and quantitatively that this apparently simple task actually provides a very powerful supervisory signal for semantic feature learning. We exhaustively evaluate our method in various unsupervised feature learning benchmarks and we exhibit in all of them state-of-the-art performance. Specifically, our results on those benchmarks demonstrate dramatic improvements w.r.t. prior state-of-the-art approaches in unsupervised representation learning and thus significantly close the gap with supervised feature learning. For instance, in PASCAL VOC 2007 detection task our unsupervised pre-trained AlexNet model achieves the state-of-the-art (among unsupervised methods) mAP of 54.4% that is only 2.4 points lower from the supervised case. We get similarly striking results when we transfer our unsupervised learned features on various other tasks, such as ImageNet classification, PASCAL classification, PASCAL segmentation, and CIFAR-10 classification. The code and models of our paper will be published on: https://github.com/gidariss/FeatureLearningRotNet
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Communication dans un congrès
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https://hal-enpc.archives-ouvertes.fr/hal-01832768
Contributeur : Nikos Komodakis <>
Soumis le : lundi 9 juillet 2018 - 08:32:25
Dernière modification le : mercredi 26 février 2020 - 19:06:07

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  • HAL Id : hal-01832768, version 1
  • ARXIV : 1803.07728

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Citation

Nikos Komodakis, Spyros Gidaris. Unsupervised representation learning by predicting image rotations. International Conference on Learning Representations (ICLR), Apr 2018, Vancouver, Canada. ⟨hal-01832768⟩

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